He then moved north to Antioch, with assistance from his brother Qutb ad-Din in Mosul, his other vassals from Aleppo and Damascus, and the Ortoqids of the Jazira, and besieged the fortress of Harim (Harenc) in 1164.

They were joined by Konstantinos Kalamanos, the Byzantine governor of Cilicia, and Thoros, and Mleh of Armenia, as well as Hugh VIII of Lusignan and Geoffrey Martel, brother of William VI of Angoulême, both of whom had recently arrived on pilgrimage.

Nur ad-Din prepared to give up the siege when they arrived, but the crusaders, inspired by the victory at al-Buqaia, and, "regardless of the rules of military discipline ... recklessly dispersed and roved hither and yon in pursuit of the foe."

Nur ad-Din's troops defended against their charge and led a counterattack, pushing the crusaders into a swamp, and they were massacred "like victims before the altar."

With Amalric absent in Egypt, all three crusader states were now without their rulers, but Nur ad-Din did not want to attack Antioch itself for fear of provoking a Byzantine response, as the Principality was technically an Imperial fief.